Abstract
The enthalpies of solution in 2 N nitric acid at 298 K were measured for alkali metal borate glasses and crystals. From the data obtained, their enthalpies of formation from the oxides and the heats of crystallization of the glasses were calculated. The negative deviation from ideality observed in alkali metal borate systems is interpreted in terms of the acid-base interaction of their components. The heats of crystallization of the glasses appeared to be mainly determined by the ordering effect of the boron-oxygen network. The contents of different borate groupings in the glasses studied were estimated. The structures of the borate glasses are discussed.
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